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Ventricular myocardial band

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https://www.readbyqxmd.com/read/29770745/2706-km-cycling-in-two-weeks-effects-on-cardiac-function-in-six-elderly-male-athletes
#1
Thomas Morville, Mads Rosenkilde, Nick Mattsson, Flemming Dela, Jørn W Helge, Hanne K Rasmusen
INTRODUCTION: Physiological effects of exercise on trained and untrained individuals have been studied extensively. Typically, young or middle-aged individuals are examined before and after short periods of vigorous exertion. METHODS: We studied six elderly male athletes (61±8 years (mean ± SD); baseline VO2 max 48±5 ml·kg-1 · min-1 ) with focus on cardiac function and biomarkers following 14 consecutive days of moderate intensity exercise. Cardiac dimensions, function, biomarkers, and other measures of cardiovascular health were examined at baseline and 2 and 28 h after the last day of cycling a total of 2706 km...
May 17, 2018: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29753818/routine-papillary-muscle-realignment-and-septal-myectomy-for-obstructive-hypertrophic-cardiomyopathy
#2
Howard K Song, Jason Turner, Rebekah Macfie, Suwen Kumar, Meghan J Mannello, Danielle Smith, Castigliano Bhamidipati, Jaishankar Raman, Frederick Tibayan, Stephen B Heitner
BACKGROUND: Septal myectomy has been the mainstay of the surgical treatment of obstructive hypertrophic cardiomyopathy (HCM), however recently there is growing appreciation for associated mitral valve abnormalities that contribute to left ventricular outflow tract (LVOT) obstruction. In this study, we describe our experience with combined papillary muscle realignment (PMR) and septal myectomy for the treatment of obstructive HCM. METHODS: We identified 44 patients undergoing surgery for obstructive HCM whose anatomy was amenable to combined PMR and septal myectomy at our institution over a 20-month period...
May 10, 2018: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/29716898/load-dependent-changes-in-left-ventricular-structure-and-function-in-a-pathophysiologically-relevant-murine-model-of-reversible-heart-failure
#3
Carla J Weinheimer, Attila Kovacs, Sarah Evans, Scot J Matkovich, Philip M Barger, Douglas L Mann
BACKGROUND: To better understand reverse left ventricular (LV) remodeling, we developed a murine model wherein mice develop LV remodeling after transverse aortic constriction (TAC) and a small apical myocardial infarct (MI) and undergo reverse LV remodeling after removal of the aortic band. METHODS AND RESULTS: Mice studied were subjected to sham (n=6) surgery or TAC+MI (n=12). Two weeks post-TAC+MI, 1 group underwent debanding (referred to as heart failure debanding [HF-DB] mice; n=6), whereas the aortic band remained in a second group (heart failure [HF] group; n=6)...
May 2018: Circulation. Heart Failure
https://www.readbyqxmd.com/read/29599211/experimental-right-ventricular-hypertension-induces-regional-%C3%AE-1-integrin-mediated-transduction-of-hypertrophic-and-profibrotic-right-and-left-ventricular-signaling
#4
Mei Sun, Ryo Ishii, Kenichi Okumura, Adrienn Krauszman, Siegfried Breitling, Olga Gomez, Aleksander Hinek, Stellar Boo, Boris Hinz, Kim A Connelly, Wolfgang M Kuebler, Mark K Friedberg
BACKGROUND: Development of right ventricular (RV) hypertension eventually contributes to RV and left ventricular (LV) myocardial fibrosis and dysfunction. The molecular mechanisms are not fully elucidated. METHODS AND RESULTS: Pulmonary artery banding was used to induce RV hypertension in rats in vivo. Then, we evaluated cardiac function and regional remodeling 6 weeks after pulmonary artery banding. To further elucidate mechanisms responsible for regional cardiac remodeling, we also mimicked RV hypertensive stress by cyclic mechanical stretching applied to confluent cultures of cardiac fibroblasts, isolated from the RV free wall, septal hinge points, and LV free wall...
March 29, 2018: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29560630/-effect-of-electroacupuncture-at-neiguan-pc-6-on-serum-and-myocardial-metabolites-in-rats-with-myocardial-ischemia-reperfusion-injury-based-on-nuclear-magnetic-resonance-spectroscopy
#5
Ya-Ni Tang, Cheng-Fu Tan, Wei-Wei Liu, Jie Yan, Chao Wang, Mi Liu, Dong-Hai Lin, Cai-Hua Huang, Lin Du, Mei-Lin Chen, Jiao-Lan Li, Ding-Ming Zhu
OBJECTIVE: We have repeatedly demonstrated that electroacupuncture (EA) of "Neiguan"(PC 6) can improve myocardial ischemia in rats. The present study was designed to investigate the metabolomic profile of peripheral blood se-rum and myocardium involving EA-induced improvement of myocardial ischemia-reperfusion injury (MIRI) in rats by using nuclear magnetic resonance spectroscopy. METHODS: Thirty male SD rats were equally randomized into blank control, model and EA groups...
March 25, 2018: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29555834/multiplexed-optical-imaging-of-energy-substrates-reveals-that-left-ventricular-hypertrophy-is-associated-with-brown-adipose-tissue-activation
#6
REVIEW
Marcello Panagia, Howard H Chen, Dominique Croteau, Yin-Ching Iris Chen, Chongzhao Ran, Ivan Luptak, Lee Josephson, Wilson S Colucci, David E Sosnovik
BACKGROUND: Substrate utilization in tissues with high energetic requirements could play an important role in cardiometabolic disease. Current techniques to assess energetics are limited by high cost, low throughput, and the inability to resolve multiple readouts simultaneously. Consequently, we aimed to develop a multiplexed optical imaging platform to simultaneously assess energetics in multiple organs in a high throughput fashion. METHODS AND RESULTS: The detection of 18F-Fluordeoxyglucose uptake via Cerenkov luminescence and free fatty acid uptake with a fluorescent C16 free fatty acid was tested...
March 2018: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/29350681/aav-9-mediated-phosphatase-1-inhibitor-1-overexpression-improves-cardiac-contractility-in-unchallenged-mice-but-is-deleterious-in-pressure-overload
#7
D M Schwab, L Tilemann, R Bauer, M Heckmann, A Jungmann, M Wagner, J Burgis, C Vettel, H A Katus, A El-Armouche, O J Müller
The downregulation of β-adrenergic receptors (β-AR) and decreased cAMP-dependent protein kinase activity in failing hearts results in decreased phosphorylation and inactivation of phosphatase-inhibitor-1 (I-1), a distal amplifier element of β-adrenergic signaling, leading to increased protein phosphatase 1 activity and dephosphorylation of key phosphoproteins, including phospholamban. Downregulated and hypophosphorylated I-1 likely contributes to β-AR desensitization; therefore its modulation is a promising approach in heart failure treatment...
January 2018: Gene Therapy
https://www.readbyqxmd.com/read/29205803/septal-reduction-therapy-using-nonalcohol-agent-in-hypertrophic-obstructive-cardiomyopathy-single-center-experience
#8
Serkan Asil, Barış Kaya, Uğur Canpolat, Hikmet Yorgun, Levent Şahiner, Cem Çöteli, Anıl Arat, Kudret Aytemir
AIMS: Percutaneous septal reduction therapy by either alcohol or nonalcohol agents is an alternative approach to surgery in drug-refractory symptomatic patients with hypertrophic obstructive cardiomyopathy (HOCM). Nonalcohol agents have some advantages and disadvantages over alcohol during the procedure. Nowadays, a novel non-alcohol agent, named as Ethylene-vinyl alcohol (EVOH) copolymer (Onyx® and Squid® ), is used during septal ablation. Thus, in this study, we aimed to evaluate both acute and long-term efficacy and safety profile of EVOH during septal ablation in HOCM...
December 5, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29187205/combined-double-chambered-right-ventricle-tricuspid-valve-dysplasia-ventricular-septal-defect-and-subaortic-stenosis-in-a-dog
#9
Iuliu Scurtu, Flaviu Tabaran, Mircea Mircean, Gavril Giurgiu, Andras Nagy, Cornel Catoi, Dan G Ohad
BACKGROUND: Double chambered right ventricle (DCRV) is a congenital heart anomaly where the right ventricle is divided into two chambers. We describe, for the first time, an unusual combination of DCRV combined with some other congenital heart defects. CASE PRESENTATION: A 1.2-year-old Golden Retriever was presented with lethargy, exercise intolerance and ascites. Physical examination revealed an irregularly irregular pulse and a grade V/VI, systolic, right cranial murmur...
November 29, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29175946/hypertrophied-myocardium-is-vulnerable-to-ischemia-reperfusion-injury-and-refractory-to-rapamycin-induced-protection-due-to-increased-oxidative-nitrative-stress
#10
Lei-Lei Ma, Yang Li, Pei-Pei Yin, Fei-Juan Kong, Jun-Jie Guo, Hong-Tao Shi, Jian-Bing Zhu, Yun-Zeng Zou, Jun-Bo Ge
Left ventricular hypertrophy (LVH) is causally related to increased morbidity and mortality following acute myocardial infarction (AMI) via still unknown mechanisms. Although rapamycin exerts cardioprotective effects against myocardial ischemia/reperfusion (MI/R) injury in normal animals, whether rapamycin-elicited cardioprotection is altered in the presence of LVH has yet to be determined. Pressure overload induced cardiac hypertrophied mice and sham-operated controls were exposed to AMI by coronary artery ligation, and treated with vehicle or rapamycin 10 min before reperfusion...
January 16, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29029119/the-end-of-the-unique-myocardial-band-part-ii-clinical-and-functional-considerations
#11
David H MacIver, John B Partridge, Peter Agger, Robert S Stephenson, Bastiaan J D Boukens, Camilla Omann, Jonathan C Jarvis, Henggui Zhang
Two of the leading concepts of mural ventricular architecture are the unique myocardial band and the myocardial mesh model. We have described, in an accompanying article published in this journal, how the anatomical, histological and high-resolution computed tomographic studies strongly favour the latter concept. We now extend the argument to describe the linkage between mural architecture and ventricular function in both health and disease. We show that clinical imaging by echocardiography and magnetic resonance imaging, and electrophysiological studies, all support the myocardial mesh model...
January 1, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28958005/the-end-of-the-unique-myocardial-band-part-i-anatomical-considerations
#12
David H MacIver, Robert S Stephenson, Bjarke Jensen, Peter Agger, Damián Sánchez-Quintana, Jonathan C Jarvis, John B Partridge, Robert H Anderson
The concept of the 'unique myocardial band', which proposes that the ventricular myocardial cone is arranged like skeletal muscle, provides an attractive framework for understanding haemodynamics. The original idea was developed by Francisco Torrent-Guasp. Using boiled hearts and blunt dissection, Torrent-Guasp created a single band of ventricular myocardium extending from the pulmonary trunk to the aortic root, with the band thus constructed encircling both ventricular cavities. Cooked hearts can, however, be dissected in many ways...
January 1, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28947592/will-the-real-ventricular-architecture-please-stand-up
#13
Julien I E Hoffman
Ventricular twisting, essential for cardiac function, is attributed to the contraction of myocardial helical fibers. The exact relationship between ventricular anatomy and function remains to be determined, but one commonly used explanatory model is the helical ventricular myocardial band (HVMB) model of Torrent-Guasp. This model has been successful in explaining many aspects of ventricular function, (Torrent-Guasp et al. Eur. J. Cardiothorac. Surg., 25, 376, 2004; Buckberg et al. Eur. J. Cardiothorac. Surg...
September 2017: Physiological Reports
https://www.readbyqxmd.com/read/28928610/does-heart-type-fatty-acid-binding-protein-predict-clinical-outcomes-after-pediatric-cardiac-surgery
#14
Egmond S Evers, Varsha Walavalkar, Suresh Pujar, Latha Balasubramanian, Frits W Prinzen, Tammo Delhaas, Ward Y Vanagt, Shreesha Maiya
INTRODUCTION: The early identification of vulnerable pediatric cardiac surgery patients can help clinicians provide them with timely support. Heart-type fatty acid-binding protein. (H-FABP) is an early biomarker of myocardial injury in acute myocardial infarction in adults. In this study, we evaluated the correlations between postoperative H-FABP, creatine kinase-myocardial band (CK-MB), troponin-I, total bypass time, and clinical outcomes. METHODS: In 32 pediatric patients that underwent ventricular septal defect...
September 2017: Annals of Pediatric Cardiology
https://www.readbyqxmd.com/read/28899895/biomechanical-and-hemodynamic-measures-of-right-ventricular-diastolic-function-translating-tissue-biomechanics-to-clinical-relevance
#15
Sae Jang, Rebecca R Vanderpool, Reza Avazmohammadi, Eugene Lapshin, Timothy N Bachman, Michael Sacks, Marc A Simon
BACKGROUND: Right ventricular (RV) diastolic function has been associated with outcomes for patients with pulmonary hypertension; however, the relationship between biomechanics and hemodynamics in the right ventricle has not been studied. METHODS AND RESULTS: Rat models of RV pressure overload were obtained via pulmonary artery banding (PAB; control, n=7; PAB, n=5). At 3 weeks after banding, RV hemodynamics were measured using a conductance catheter. Biaxial mechanical properties of the RV free wall myocardium were obtained to extrapolate longitudinal and circumferential elastic modulus in low and high strain regions (E1 and E2 , respectively)...
September 12, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28882138/a-dual-therapy-of-off-pump-temporary-left-ventricular-extracorporeal-device-and-amniotic-stem-cell-for-cardiogenic-shock
#16
Toshinobu Kazui, Phat L Tran, Tia R Pilikian, Katie M Marsh, Raymond Runyan, John Konhilas, Richard Smith, Zain I Khalpey
BACKGROUND: Temporary mechanical circulatory support device without sternotomy has been highly advocated for severe cardiogenic shock patient but little is known when coupled with amniotic stem cell therapy. CASE PRESENTATION: This case reports the first dual therapy of temporary left ventricular extracorporeal device CentriMag with distal banding technique and human amniotic stem cell injection for treating a severe refractory cardiogenic shock of an 68-year-old female patient...
September 7, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/28808515/palpitations-as-a-presenting-feature-of-multisystem-sarcoidosis
#17
Richie Manikat, Julieta Gilson, Mahesh Krishnamurthy, Koroush Khalighi
Introduction: Sarcoidosis is described as a systemic condition characterized by non-caseating granulomas in multiple organs. In this report, we present an unusual manifestation of cardiac sarcoidosis and review management strategies. Case presentation: A 29-year-old African-American man presented with weight loss, fatigue, dyspnea, palpitations, night sweats, painless left eye redness and bilateral leg pain over the course of three months. His physical exam revealed left conjunctival congestion and bilateral crackles on auscultation...
July 2017: Journal of Community Hospital Internal Medicine Perspectives
https://www.readbyqxmd.com/read/28760475/cardiac-progenitor-cells-enhance-neonatal-right-ventricular-function-after-pulmonary-artery-banding
#18
Brody Wehman, Nicholas Pietris, Grace Bigham, Osama Siddiqui, Rachana Mishra, Tieluo Li, Emily Aiello, Godly Jack, Wendy Wang, Sarah Murthi, Sudhish Sharma, Sunjay Kaushal
BACKGROUND: C-kit+ cardiac progenitor cells (CPCs) have been shown to be safe and effective in large-animal models and in an early-phase clinical trial for adult patients with ischemic heart disease. However, CPCs have not yet been evaluated in a preclinical model of right ventricular (RV) dysfunction, which is a salient feature of many forms of congenital heart disease. METHODS: Human c-kit+ CPCs were generated from right atrial appendage biopsy specimens obtained during routine congenital cardiac operations...
December 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28754809/ventricular-function-and-vascular-dimensions-after-norwood-and-hybrid-palliation-of-hypoplastic-left-heart-syndrome
#19
Heiner Latus, Mohamed S Nassar, James Wong, Pauline Hachmann, Hannah Bellsham-Revell, Tarique Hussain, Christian Apitz, Caner Salih, Conal Austin, David Anderson, Can Yerebakan, Hakan Akintuerk, Juergen Bauer, Reza Razavi, Dietmar Schranz, Gerald Greil
OBJECTIVE: Norwood and hybrid procedure are two options available for initial palliation of patients with hypoplastic left heart syndrome (HLHS). Our study aimed to assess potential differences in right ventricular (RV) function and pulmonary artery dimensions using cardiac magnetic resonance (CMR) in survivors with HLHS. METHODS: 42 Norwood (mean age 2.4±0.8) and 44 hybrid (mean age 2.0±1.0 years) patients were evaluated by CMR after stage II palliation prior to planned Fontan completion...
February 2018: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28734926/derivation-and-evaluation-of-age-specific-multivariate-reference-regions-to-aid-in-identification-of-abnormal-filling-patterns-the-hunt-and-vamis-studies
#20
Jonas Selmeryd, Egil Henriksen, Håvard Dalen, Pär Hedberg
OBJECTIVES: This study aimed to derive age-specific multivariate reference regions (MVRs) able to classify subjects into those having normal or abnormal filling patterns and to evaluate the prognostic impact of this classification. BACKGROUND: The integration of several parameters is necessary to diagnose disorders of left ventricular (LV) filling because no single measurement accurately describes the complexity of diastolic function. However, no generally accepted validated multiparametric algorithm currently exists...
March 2018: JACC. Cardiovascular Imaging
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